Daniel Oh
Featured contributor MSc Applied Statistics; 7 years in analytics and data tooling.

Daniel Oh

Senior Contributor, Math & Statistics

0 calculators 0 articles Member since Jun 2026
Ecology

Heat Index Calculator

Compute the heat index — the apparent temperature combining air temperature and relative humidity — using the NWS Rothfu...

basic
9,146 4.9 1 min
Math / Percentage

Modulo Calculator

Get the remainder and quotient of integer division — the building block of modular arithmetic.

basic
13,133 4.4 1 min
Math / Percentage

Fibonacci Calculator

Compute the n-th Fibonacci number F(n), its neighbors F(n−1) and F(n+1), and the running sum of the first n terms.

basic
14,333 4.7 1 min
Math / Fractions

GCF Calculator

Find the greatest common factor (also called GCD) of any list of whole numbers using the Euclidean algorithm.

basic
18,066 4.0 1 min
Other / Time & Date

Days Until Date Calculator

Count the number of days, weeks, months, and years between today and any chosen date — past or future.

basic
9,136 4.6 1 min
Other / Games

MTG Mana Base Calculator

Estimate the number of lands of each color needed in a 60-card Magic: The Gathering deck from the number of coloured pip...

basic
9,662 4.1 1 min
tutorial Math

Percentages Without the Headache

Every "X% of Y" problem, every "what percent of", every percent-change question — written out the way you'd actually say them.

Daniel Oh Daniel Oh
3 min

Reviewed by Daniel Oh

These calculators were technically reviewed by Daniel Oh for accuracy.